Added 'parent is/was in tree' param to bind_to_tree/unbind_from_tree

According to a talk with Ms2ger, both bind_to_tree / unbind_from_tree
should be called regardless if the tree is part of a Document. This
information is now passed as a parameter to their respective virtual
methods.

src/components/script/dom/element.rs

@@ -836,12 +836,14 @@ impl<'a> VirtualMethods for JSRef<'a, Element> {
         }
     }
 
-    fn bind_to_tree(&self) {
+    fn bind_to_tree(&self, tree_in_doc: bool) {
         match self.super_type() {
-            Some(ref s) => s.bind_to_tree(),
+            Some(ref s) => s.bind_to_tree(tree_in_doc),
             _ => (),
         }
 
+        if !tree_in_doc { return; }
+
         match self.get_attribute(Null, "id").root() {
             Some(attr) => {
                 let doc = document_from_node(self).root();
@@ -851,12 +853,14 @@ impl<'a> VirtualMethods for JSRef<'a, Element> {
         }
     }
 
-    fn unbind_from_tree(&self) {
+    fn unbind_from_tree(&self, tree_in_doc: bool) {
         match self.super_type() {
-            Some(ref s) => s.unbind_from_tree(),
+            Some(ref s) => s.unbind_from_tree(tree_in_doc),
             _ => (),
         }
 
+        if !tree_in_doc { return; }
+
         match self.get_attribute(Null, "id").root() {
             Some(attr) => {
                 let doc = document_from_node(self).root();

src/components/script/dom/htmliframeelement.rs

@@ -176,12 +176,14 @@ impl<'a> VirtualMethods for JSRef<'a, HTMLIFrameElement> {
         }
     }
 
-    fn bind_to_tree(&self) {
+    fn bind_to_tree(&self, tree_in_doc: bool) {
         match self.super_type() {
-            Some(ref s) => s.bind_to_tree(),
+            Some(ref s) => s.bind_to_tree(tree_in_doc),
             _ => (),
         }
 
+        if !tree_in_doc { return; }
+
         match self.get_url() {
             Some(url) => {
                 let sandboxed = if self.is_sandboxed() {

src/components/script/dom/htmlstyleelement.rs

@@ -79,9 +79,9 @@ impl<'a> VirtualMethods for JSRef<'a, HTMLStyleElement> {
         self.parse_own_css();
     }
 
-    fn bind_to_tree(&self) {
+    fn bind_to_tree(&self, tree_in_doc: bool) {
         match self.super_type() {
-            Some(ref s) => s.bind_to_tree(),
+            Some(ref s) => s.bind_to_tree(tree_in_doc),
             _ => ()
         }
         self.parse_own_css();

src/components/script/dom/node.rs

@@ -233,7 +233,7 @@ pub enum NodeTypeId {
 
 trait PrivateNodeHelpers {
     fn node_inserted(&self);
-    fn node_removed(&self);
+    fn node_removed(&self, parent_in_doc: bool);
     fn add_child(&self, new_child: &JSRef<Node>, before: Option<JSRef<Node>>);
     fn remove_child(&self, child: &JSRef<Node>);
 }
@@ -243,11 +243,10 @@ impl<'a> PrivateNodeHelpers for JSRef<'a, Node> {
     fn node_inserted(&self) {
         assert!(self.parent_node().is_some());
         let document = document_from_node(self).root();
+        let is_in_doc = self.is_in_doc();
 
-        if self.is_in_doc() {
-            for node in self.traverse_preorder() {
-                vtable_for(&node).bind_to_tree();
-            }
+        for node in self.traverse_preorder() {
+            vtable_for(&node).bind_to_tree(is_in_doc);
         }
 
         let parent = self.parent_node().root();
@@ -257,13 +256,12 @@ impl<'a> PrivateNodeHelpers for JSRef<'a, Node> {
     }
 
     // http://dom.spec.whatwg.org/#node-is-removed
-    fn node_removed(&self) {
+    fn node_removed(&self, parent_in_doc: bool) {
         assert!(self.parent_node().is_none());
         let document = document_from_node(self).root();
 
         for node in self.traverse_preorder() {
-            // XXX how about if the node wasn't in the tree in the first place?
-            vtable_for(&node).unbind_from_tree();
+            vtable_for(&node).unbind_from_tree(parent_in_doc);
         }
 
         document.deref().content_changed();
@@ -1187,8 +1185,9 @@ impl Node {
         // Step 6: mutation records.
 
         // Step 7.
+        let parent_in_doc = parent.is_in_doc();
         for removedNode in removedNodes.iter() {
-            removedNode.node_removed();
+            removedNode.node_removed(parent_in_doc);
         }
         for addedNode in addedNodes.iter() {
             addedNode.node_inserted();
@@ -1224,7 +1223,7 @@ impl Node {
         // Step 9.
         match suppress_observers {
             Suppressed => (),
-            Unsuppressed => node.node_removed(),
+            Unsuppressed => node.node_removed(parent.is_in_doc()),
         }
     }
 
@@ -1713,7 +1712,7 @@ impl<'a> NodeMethods for JSRef<'a, Node> {
 
         // Step 12-14.
         // Step 13: mutation records.
-        child.node_removed();
+        child.node_removed(self.is_in_doc());
         if node.type_id() == DocumentFragmentNodeTypeId {
             for child_node in node.children() {
                 child_node.node_inserted();

src/components/script/dom/virtualmethods.rs

@@ -60,18 +60,20 @@ pub trait VirtualMethods {
         }
     }
 
-    /// Called when a Node is appended to a tree that is part of a Document.
-    fn bind_to_tree(&self) {
+    /// Called when a Node is appended to a tree, where 'tree_in_doc' indicates
+    /// whether the tree is part of a Document.
+    fn bind_to_tree(&self, tree_in_doc: bool) {
         match self.super_type() {
-            Some(ref s) => s.bind_to_tree(),
+            Some(ref s) => s.bind_to_tree(tree_in_doc),
             _ => (),
         }
     }
 
-    /// Called when a Node is removed from a tree that is part of a Document.
-    fn unbind_from_tree(&self) {
+    /// Called when a Node is removed from a tree, where 'tree_in_doc'
+    /// indicates whether the tree is part of a Document.
+    fn unbind_from_tree(&self, tree_in_doc: bool) {
         match self.super_type() {
-            Some(ref s) => s.unbind_from_tree(),
+            Some(ref s) => s.unbind_from_tree(tree_in_doc),
             _ => (),
         }
     }